The USS Whistler (SP-784) was a United States Navy patrol vessel commissioned during World War I, serving from 1917 to 1919. Originally constructed as a private motorboat, she was built in 1917 by J. E. Graves in Marblehead, Massachusetts. The vessel was owned by Lawrence F. Percival of Boston before being acquired by the Navy on 17 May 1917 for wartime service. Designed as a motorboat, the USS Whistler was designated as a section patrol (SP-784), a role that entailed harbor patrol and dispatch duties. She was officially commissioned into the Navy on 31 July 1917. Throughout her service, Whistler was assigned to the Boston Section of the 1st Naval District, operating primarily from the naval district’s headquarters at Commonwealth Pier in Boston. Her patrol duties focused on harbor entrance security, where she conducted routine patrols to monitor and safeguard the harbor during the war. In addition to her patrol duties, USS Whistler occasionally served as a dispatch boat, transporting messages between vessels and command stations within the harbor. Notably, she stood by the submarine USS O-5 (Submarine No. 66) during her pre-commissioning submarine sea trials on 30 May 1918, highlighting her role in supporting submarine operations. After the conclusion of World War I, USS Whistler was decommissioned on 19 May 1919 and subsequently stricken from the Navy List on the same day. She was sold to J. E. Doherty of Boston on 20 June 1919. Her service exemplifies the use of private vessels converted for naval patrol duties during wartime, contributing to harbor security and auxiliary support for submarine testing during her brief but active naval career.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.